Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 77,598	$ (1,142)	$ 147,446	$ 19,335
Available-for-sale investments:
Net unrealized gain (loss) on available-for-sale investments, net of tax	(138)	12,451	(2,096)	8,590
Reclassification of credit loss (recovery) on investments into current operations	0	(85)	0	75
Reclassification of net realized (gain) loss on the sale of available-for-sale investments into current operations	(68)	(955)	(68)	(2,805)
Net change related to available-for-sale investments	(206)	11,411	(2,164)	5,860
Foreign currency translation adjustments:
Foreign currency translation adjustments	(337)	1,903	(3,107)	(5,462)
Other comprehensive income (loss), net of tax	(543)	13,314	(5,271)	398
Total comprehensive income	$ 77,055	$ 12,172	$ 142,175	$ 19,733